Turbine bleeder valve



June 16, 1925.

J. L. MOORE TURBINE BLEEDER VALVE Filed May 9, 192.3

2 Sheets-Sheet 1 second or a lower pressure stage. The first stage orhigh pressure chamber 14 is provided with an opening 141 or bleederconnection, (see Fig. 1), which is adapted to be in communication withthe heating system, or other auxiliary device of the plant.

In each of said chambers 14 and 15 are re spectively stator members 16and 17 and rotor members 18 and 19, said rotor mem bers 18 and 19 beingfixed to a rotary shaft 20 supported in suitable fiuidtight bearings 21within the front and rear heads of the casing 10 as is common in thisclass of engines and forms no part of the present invention.

The casing 10 or cylinder of the turbine at the section correspondingpreferably at the upper edge of the diaphragm 13 is so "formed andconstructed as to provide an opening or passageway 22 which forms acommunication between the first or high pressure stage chamber 14 andthe second or lower pressure stage 15. The cylinder or casing 10 and theupper edge of the diaphragm 13 are bored transversely to thelongitudinal axis of the turbine in such a manner as to form jointly acircular valve seat 23 in which is disposed or arranged the rotatablebleeder valve 24. Said bleeder valve 24 is supported and carried by twostub valve stems or spindles 25 and 26, which stems rest in bearings 27,27, as shown, on either side of the turbine casing 10, and said valvestems 25 and 26 are so proportioned with respect to their bearings 27,and arranged with regard to the body oi the bleeder "alve that saidstems or spindles 25 and 26 carry the full weight of said valve 24 andthe clearance of the stems 25 and 26 in their bearin s is such that saidvalve 24 may be easily turned by a gover nor, not shown, and illustratedfor example in U. S. Patent No. 801,322 to Kerr, dated October 10, 1905,which may be attached or linked to a lever or arm 28 on the outer end ofthe stem 26, as indicated in Figure 1, and common in this class ofinventions and needs no further disclosure.

The main body of said bleeder valve 24 is termed with two longitudinalsections or walls 29 and 30 which are separated to form an enclosedinterior chamber 31 within the valve 24, and said chamber 81 is capableof communicating with the first or high pressure stage chamber 14through an opening 32, and an outlet or bleeder opening or openings 38,for said interior valve chamber 31 is provided in the wall 29, asclearly shown in Figures 2 and 3, and said walls 29 and 30 are soconstructed and arranged with respect to the opening 22 and valve seat23, so that when the valve 24 is turned into its open position, as shownin Figure 3, the two chambers 14 and 15 on the opposite sides of thediaphragm 13 are in communication with each other through the passagewayor opening 22, thereby permitting the partialh. expanded steam to passfrom the first stage to the succeeding stages of expansion and to the,final exhaust opening and thence to the condenser, not shown.

lVhen the-valve 24 is adjusted in its closed position, or as shown inFigure 2, a slight leakage of steam from the chamber 14 to chamber 15can take place through the opening 32 into the chamber 31 and interiorof valve 24 and through the outlet or bleeder opening 33 to the chamber15. By this arrangement and construction of valve 24 with respect to thewalls 29 and 30 and openings or outlets 32 and S3 to chamber 31 inrelation to the valve seat 23 and chambers 14 and 15, not only will asmall quantity of steam be enabled to pass at all times through thefinal stages of the turbine to the condenser, when the valve 24 is inits closed position, and thereby prevents these final stages frombecoming overheated, as when running dry or without expanded steam as inprior turbines provided with bleeder valves, but at the same time, dueto the manner of supporting said bleeder valve 24 by the stub shafts 25and 26, insures the easy turning and operation of the valve at all timesand eliminates all danger of the bleeder valve 24 sticking or rusting toits seat during the summer months when the bleeder valve 24 is open, asshown in Figure 3, and no expanded steam is used in connection with theheating system, or for other auxiliary use or apparatus of the plant.

From the foregoing disclosure, it will be readily seen that when thevalve 24 is in its closed position, as shown in Figure 2, the steam inbleeding from chambers 14 to 15 passes through the interior of the valve24 by opening 32, inner valve chamber 31, and opening 33, and in sodoing uniformly heats up the two longitudinal walls or partitions 29 and30 and their connected circuml'erent ial sections, in such a manner asto evenly expand or contract all the sections of the valve, and therebyprevent any distortion or warping of said valve 24-, which enables thevalve to be easily turned in its seat or adjusted under all conditionsand ten'iperatures. Said hollow construction of the valve 24 andlongitudinal walls 29 and 30 provides a. valve not only of unusuallightness, but at the same time of great stillness and enahlm the wallsor sections 01 the valve to be made thin, thereby insuring a quickresponse to sudden changes of temperatures throughout the entire valveportions.

By reference to Figure 3, it will also be seen by the shape andconfiguration of the valve 24 and its arrangement with respect to thediaphragm 13 and seat 22 in casing 1 scares 10, avlar'ge "undiiv 'd'edor unrestricted crosssectional area or aperture .formin'g passageway oropening 522 canlbc'opened up between lhe two chambers 1d and 15,therebyeffectmg a minimum"reduction in pressure of the steam in'lpassingfrom chambers 14 to 15 and hence greatly increase the efficiency oi the"turbine during the six or seven months when no steam is being bled. p

' From th'e "foregoing description of "the const guction and arrangementof pa1'ts,inode of assembling the sameand their operation, it will beseen that an the objectsand advantages recited in the statement ofinvention have been fu1ly,-eiiiciently and cheaply carried-out, andwhile the preferred lOCIn has {been shown and described, it is to beunderstood that many changes will sug gest themselves without in any wayvarying the essential features of construction or departing. from -thespirit of the invention as expressed in thejclaims.

,VVhat I claim is:- l l. A miilti-stage expansion steam turbinecomprising a casing having a live steam or high pressure inlet and-finallow pressure outlet, means "for effecting a plurality of stages ofexpansion within said casing and ,interposed between said inlet andoutlet, a diaphragm within thercasmg-separating one st ge of'expansionfrom a succeeding stage of expansion andaprov-idedwith an opening for"the passage of th'e jsteam from one stage to the adjacent succeedingstage of expansion, an intermed iate steam pressure outlet communicatingwith a stage ahead of the diaphragm and receiving expanded steam andexterior of the casing, a rotary bleeder valve disposed in said openingand provided with ports' arranged and adapted to control the passage ofthe expanded steam through said opening from one stage to a succeedingstage or into the intermediate fluid pressure outlet, said bleeder valveprovided with a chamber therein having openings or outlets communic-l ngwith the exterior of said valve and. arranged and adapted to permit thesteam to bleed into and through said chamber and valve when said valveis in its closed position, thereby uniformly heating all sections ofsaid valve and permitting a small volume of expanded steam to constantlypass through the other stages of expansion between said diaphragm andfinal low pres sure outlet. 7

2. A multistage expansion steam turbine comprising a casing having ahigh pressure inlet and final low pressure outlet, means for effecting aplurality of stages of expansion within said casing and interposedbetween said inlet and outlet, a diaphragm Withir. the casing separatingone stage of expansion from a succeeding stage of expansion and pr videdwith a eecle valve seat and an valve disposed within said seat and soprovided with ports, arranged and. adapted to control the passage of theexpanded steam through said opening t'rom one stage to a succeedingstage or into the intermediate fluicl pres. ire outlet, said bleedervalve haw ingtwo separate longitudinal walls forming an interior chamberprovided with openings or outlets communicating with the exterior ofsaid valve and arranged and adapted to permit the steam to bleed intoand through said chamber and valve when said valve is in its closedposition, thereby uniformly heating all sections of said valve andpermitting a small volume of expanded steam toconstantly pass throughthe other stages expansion "between said diaphragm and final lowpressure outlet. a

3. it multistage expansion steam turbine comprising a casing having alive steam or high ,pressiu e inlet and iinal low pressure outlet, meansfor eflecting a plurality of es of expansion within said casing andinterposed between said inletand outlet, a

diaplnta; nintho casing separating one stage of expansion from asucceeding stage oi ex-pension and provided fithanopening tortho passageot the steam from onestage to the adjacent succeeding stage ofexpansion, a bleeder valve seat in the casing adjacent to saiddiaphragm,an intern'iediate stiani pressure outlet communicating with asta e ahead of the diaphragm and receiving anded steam and exterior ofthe casing. a rotary hleeder valve disposed within said seat andprovided ith ports arranged and adapted to control the passage of theexpanded steam through said opening from one stage to a succeeding stageor into the intermediate fluid pressure outlet, said bleedcr valveprovided with a chamber therein having openings or outletsco1nmunieating with the exterior of said valve and arranged and adaptedto permit the steam to bleed into and through said chamber and valvewhen said valve is in its closed position, thereby uniformly heating allsections of said valve and permitting a small volume of expanded steamto constantly pass through the other stages of expansion between saiddiaphragm and final low pressure outlet.

4;. A multistage expansion steam turbine comprising a casing having alive steam or high pressure inlet and final low pressure outlet, meansfor effecting a plurality of. stages of expansion Within said casing andinterposed between said inlet and outlet, a diaphragm within the casingseparating one stage o't expansion from a succeeding stage of expansionand provided with an unrestricted opening for the passage of the steamfrom one stage to the adjacent succeeding stage of expansion, anintermediate steam pressui'e outlet communicating with a stage ahead ofthe diaphragm and receiving expanded steam and exterior of the casing, ahollow bleeder 'alve provided with ports arranged and adapted tounobstructedly con trol the passage of the expanded steam through saidopening from one stage to a succeeding stage or into the intermediatefluid pressure outlet, said hollow bleedcr valve provided with a Chambertherein having an opening communicating with the intermediate opening inthe diaphragm for the assage ot. the steam when said bleeder valve is inits open position, whereby said steam is capable of passing into theinterior of said valve and uniformly heat the inner portion or unexposedsections of the valve by said steam passing from one stage to asucceeding stage. 4

5. A multi-stage expansion steam turbine comprising a casing provid dwith a bleeder valve seat and having a high pressure inlet and final lowpressure outlet, a plurality of expansion chambers within said casingand interposed between said inlet and outlet, an intermediate steampressure outlet communi eating with a stage ahead of the diaphragm andreceiving expanded steam and exterior of the casing, a bleeder valveprovided with ports arranged and adapted to control the passage of theexpanded steam from one stage to a succeeding stage or into theintermediate fluid pressure outlet, said bleeder 'alve provided with achamber therein having openings or outlets comn'nmicating with theexterior of said valve and arranged and adapted to permit the steam tobleed into and through said chamber and valve when said valve is in itsclosed position, thereby uniformly heating all sections of said valveand permitting a small volume of expanded steam to constantly passthrough the other stages of expansion between said diaphragm and finallow pressure outlet.

A multi-stage expansion steam turbine rotary bleeding valve providedwith a ch a1n ber therein having openings or outlets communicating withthe exterior of said valve and arranged and adapted to permit steam tobleed into or through said chamber and 'alve, thereby enabling saidsteam to uniformly heat all sections of said valve in the open or closedposition of said valve.

7. A multi-stage expansion steam turbine hollow rotary bleeding valveformed with two separated longitudinal walls provided with openings oroutlets, communicating with the exterior of said valve and arranged tolighten and at the same time stillen the valve structure and also permitsteam to bleed into or through said hollow valve to thereby enable saidsteam to uniformly heat all sections of said valve in the open or closedposition of said valve.

In testimony whereof I afiix my signature.

JAMES LEONARD MOORE.

